In 1960 the United States Navy Weather Research Facility, Norfolk;
Virginia, (NWRF) derived a set of linear regression equations having as
their purpose to extrapolate vertically height and temperature data up
to the 100-,50-, and 30-mb levels. The equations are statistically
evaluated, particularly for the latitude band 30-40 degrees, with a view
toward improving their usage in objective analysis by the United States
Navy Fleet Numerical Weather Facility, Monterey, California (FNWF) . It
is found that the equations' usefulness depends on the \"normality\" of
the synoptic situation, but in general the subject re-evaluation agrees
well with tests conducted by NWRF for previous years. An intercomparison
of stratospheric analyses at 100- , 50-, and 30-mb, as produced by the
Institute of Meteorology and Geophysics of Berlin, Germany, the United
States Weather Bureau, the Third Weather Wing of the United States Air
Force, and FNWF indicates the necessity of actual stratospheric data
(not just regression equations) for analysis at polar latitudes. Several
schemes for objective stratospheric analysis, involving minimal use of
data, are suggested by the authors.

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